I can't see the pics for some reason, but I am doing pretty much the same thing...
My plan is a pvc T and ball valve on the intake side and drain by siphon. As long as the T is below the tank you should just need to open it and the siphon will flow. If I get time to get the parts tonight I will take a pic, but for me its pretty much going to be a T with 2 1/2" hose barbs going straight through and the "T" will have the ball valve and the 3rd 1/2" barb connector. As long as you do not let the water go below the intake your hoses should not need to be primed again after.
I also am planning a fill system through the spray-bar, but that is a little more complex being the sink is in basement and tank right above, all planned out just a lot more parts. Thought about automating it all but I need to treat water, guess I could get a dosing pump to dose prime into the line, but that is getting way off topic.
You should attach the pics to the post, seems your bandwidth is maxed out that is why the pics do not show.
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Last edited by Darkblade48; 11-03-2015 at 06:53 AM.
Reason: Please use the edit function for back to back posts